Posterior tibial dysfunction, also known as posterior tibial tendon dysfunction (PTTD), is a condition that affects the posterior tibial tendon, which runs along the inside of the ankle and foot. This tendon is crucial for supporting the arch of the foot and aiding in walking, as it helps control the foot's motion during movement. When the posterior tibial tendon becomes weakened or damaged, it can lead to a collapse of the arch, causing pain, swelling, and deformity in the foot. In the early stages, symptoms may include pain along the inside of the ankle or arch, particularly during walking or standing for extended periods. As the condition progresses, it can lead to flatfoot, difficulty walking, and an altered gait. Common risk factors include injury, overuse, obesity, and conditions such as diabetes.

Treatment for posterior tibial dysfunction may involve rest,orthotics, or in severe cases, surgery to restore tendon function and alleviate symptoms.